Concrete-block mold



H. D. HENDERSON.

CONCRETE BLOCK MOLD.

APPLICATION men .IAN.L1920.

1,360,214. Patented Nov. 23, 1920. 1

Attorney H. D. HENDERSON.

CONCRETE BLOCK MOLD. APPLICATION FILED 1Arl'.1 1920.

Patented Nov 23, 1920 2 SHEETS-SHEET 2 I I Inventor HDHendersoIu Attorney H viz: the mold proper, anda removable por tion which fits therein.

PATENT OFFICE.

HAROLD ".0. HENDERSON, or YARRAVILLE, VICTORIA, AUSTRALIA.

eoNoRnrE- Loc MOLD.

Speeificationof Letters latent. Patefted N()v. 23, 1920.

Application filed Januar v, 1920. Serial No. 349,892.

f0 allwhom it mag concern:

Be it known that I, HAROLD DUDLEY HEN- DERSON, a subject of the King of Great Britain, residing at. Morven Street Yarraville, in the State of Victoria and dommonwealth of Australia, have invented newvand useful Improvements in Concrete-Block Molds, of which the following is a specification. 1

This invention consists of an improved mold for use in the manufacture of concrete and other composite blocks for building pur' poses, and has been devised for the purpose of enabling such blocks to be easily and quickly made by unskilled labor and at much less cost than at present. A further advantage is that the block can beremoved. from the mold without first dismantling it,

which is necessary with other molds inuse at present' i i r p My improvedmoldconsists oftwo parts,

consists of a metal frame composed of two vertical sides and a bottom. Rigidly at tached to the said bottom are two or more vertical metalcores, said cores being for the purpose of forming cored openings to constitute air passages in the building blocks made in said mold, and, at the same time, lessening the weight of the blocks. The removable portion, which fits Within the mold proper, consists of a false bottom having upwardly extending ends, which, when said removable portion is in position within the mold proper, constitute the ends thereof. The removable portion is an important feature of the invention, as, by means of it, the concrete block can be easily and quickly removed from the mold proper when made.

Referring now to the two sheets of drawings hereto annexed V Figure 1 is a perspective view of the mold proper.

Fig. 2 is a perspective view of the removable portion, shown removed from the mold proper.

Fig. 3 is a longitudinal vertical section of the mold filled with concrete to form abuilding block.

Fig. 4 is an underside plan view of the mold.

Fig. 5 shows a view of the mold proper raised clear of the removable portion containing theblock, the said removable por- The mold proper tion being shownin section to illustrate the receptacles for the cores attached tothe bot tomof the mold proper. i y i Fig. 6 is a perspective viewof the block after removal from the mold.

Fig. 7 is a perspective view of a modified form of mold for use in the manufacture blocks with an ornamental face.

. 1 are the vertical sides of the mold proper having an angle flange 2. riveted to the top 2} in the block showninFig. 6. The cores. 4

being rigidly attached to the bottom flanges 3 keep the-vertical sides 1 in position, and so prevent any possibility of their spreading.

The said verticalsides l are further connected together by means of suitable tie bars 6 which also form handles to facilitate the handling of the mold. Theremovable portion of themold, illustrated more particularly in. Fig. 2, comprises a bottom plate 7 and end vertical plates 8 one. of which is shown hinged to the bottom plate 7 by hinge 9 to facilitate the removal of said removable portion from the block, as illustrated in Fig. 5. Each end vertical plate 8 is fur nished with a bracket 10 and a clip 11. The

said brackets 10 and the top flanges 2 lie in the same plane when the mold is in the position shown in Fig. 3, and provide an even surface-for a scraper to pass over them to remove the surplus material from the top of the mold, as will hereinafter be described. The bottom plate 7 of the removable portion of the mold is furnished with openings 13 which correspond to the shape of the cross section of. the cores 4 in the mold. proper. These openings enable the removable portion to be readily placed in position within the mold proper (as shown in Fig. 3), and removed therefrom when required. When the removable portion is in position within the mold proper, the end plates 8 of the latter bear against the vertical sides 1 of the former, and thus prevent any lateral movement of theremovable portion. The said end plates 8 also bear against the tie bars 6 thus preventing the removable portion moving longitudinally of the mold proper when the concrete or composite materlal 1s fed thereto... The saidclips 11 on the'end plates I sides lot the mold proper is hinged to the outer edge of the adjacent angle flange 8, and theinner face of said hinged plate may have formed thereon either in intaglio or rilievo, any suitable design which it is desired to impress upon the face. In order to 'get a clear-cut impression, it is advisable that said hinged-plate should be made of brass.

' Itis of course to be understood that molds made accordingtomy invention may vary both in size and shape in order to suit various requirements; i V.

, The mode of operation'isas follows: The

mold proper, having been placed in the position shown in Fig. '1, the removable porion (shown in Fig.2) is inserted within it, so

i. that its bottom plate restsupon the flanges 3 ;constituting the bottomof the mold proper.

The-removable portion is then filled with concrete Orhother composite 'material, as illustrated-in Fig. 3, any surplus material being removed by means of a scraper being passed along the flanges 2 and brackets 1.0.

Themold is reversed, that is to say it is turned into the position shown in Fig. 0, the tiebarsor handles6 assisting in the operation. The operator then places his feet on the brackets 10 and lifts the mold proper, by means of the said handles, away from the removable portion containing the block. lle then opens outward the hinged vertical plate 8, when said removable portion can be lifted clear of the molded block, which, after being allowed to dry, is ready for use.

I claim 1. In a mold for use in the manufacture of concrete and other composite blocks for building purposes, a mold proper comprising two vertical sides, an outwardly projecting flange at the top edge of each, the bottom edge of each vertical side being bent inward toward one another to constitute flanges,

cores rigidly attached to said bottom flanges,

and tie bars for connecting said vertical sides together.

2. In a mold of the class described, the combination with the mold proper defined by claim 1, of a removable portion comprising a bottom plate having openings therein \rh ieh correspond to the shape of the cross section of the cores in the mold proper, vertical plates at each end of said bottom plate, one of said vertical plates being hinged, and each end being provided with a bracket and clip, as and for the purpose described.

3. A mold of the kind defined by claim 1 in which one of the vertical sides of the mold proper is hinged to the outer edge of the a djacent bottom angle flange, said hinged side having formed thereon, either intaglio or rilievo, any suitable design as and for the purpose described.

HAROLD D. HENDERSON. 

